-LRB- CNN -RRB- -- Timothy Bradley says he needs to beat Manny Pacquiao for a second time in Las Vegas on Saturday to move on from the controversial conclusion of their first fight two years ago .

The WBO welterweight champion won a contentious points decision when the pair met in June 2012 , inflicting a first defeat on Pacquiao in seven years .

Boxing commentators roundly criticized the result while former heavyweight champion Lennox Lewis said the scoring showed that boxing had lost its integrity .

Bradley claims he subsequently received death threats and that he was unfairly targeted by fans and the media alike for the decision of the ringside judges .

`` It would mean the world to me to get this victory for me and my family because of everything we went through in the past , '' the 30-year old told CNN 's Don Riddell .

`` It was like I stole something from the world that night . All I did was do my job . People ridiculed me , demonized me . ''

Bradley insists these dark experiences made him stronger as a person and will act as the perfect motivation ahead of the MGM Grand rematch .

He questioned Pacquiao 's hunger at the pre-fight press conference Thursday , suggesting the legendary Filipino 's best days are behind him .

Pacquiao has won world titles at seven weight divisions in a career stretching 18 years but has lost two of his last three fights .

`` What really motivates me for this fight is what my opponent said , '' Pacquiao countered in riposte to Bradley 's claims .

`` He said I do n't have the killer instinct any more , I do n't have the aggressiveness any more . This helps me , it helps a lot . ''

Although he recorded a comfortable victory over Brandon Rios last November , Pacquiao was knocked out for the first time since 1999 by Juan Manuel Marquez in his previous bout .

At 35 , it would be difficult for Pacquiao to resurrect his career at the very highest level if defeated by Bradley for a second time but he refuses to entertain this notion ahead of the contest .

`` My mind is set in the winners side not on the losers side , '' he said . `` I always think positive and not negative . ''

`` This fight on Saturday will be to prove that my journey in boxing will continue and I 'm excited for that . ''

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Timothy Bradley faces Manny Pacquiao for the WBO welterweight title in Las Vegas Saturday

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The fight is a rematch of the bitterly contested first bout between the two in 2012

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Bradley scored a points victory but received death threats after the fight